﻿// Spun AJAX Framework
// Copyright (C) 2008 Blake Hegerle
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace Spun.Controllers
{
    public static class OperationReflector
    {
        public class Exception : global::System.Exception
        {
            internal Exception(string Method, string Reason)
                : base("No suitable method named " + Method + " found because " + Reason)
            { }
        }

        public static MethodInfo FindOperation(this object On, string Method)
        {
            var Flags = BindingFlags.Public |
                BindingFlags.Instance |
                BindingFlags.IgnoreCase;

            var MethodMatch = On.GetType().GetMethod(Method, Flags);

            if (MethodMatch == null)
                throw new Exception(Method, "the method could not be found");

            if (MethodMatch.GetCustomAttributes(typeof(OperationAttribute), true).Length == 0)
                throw new Exception(Method, "the method is missing the [Operation] attribute");

            return MethodMatch;
        }
    }
}
